Trading-strategy

- Make the default behavior not to return the current candle if asked by timestamp

- Switch to `tqdm-loggable` to have better download status behavior on headless configurations
- Fine tune `visualise_ohlcv` label configuration

- Fix spelling `visualise_ohlcv`

- Add candle charts with `visualise_ohclv`

- Optimize `groupeduniverse` class, specifically `get_timestamp_range()` method

- Optimize get pair speed

- Remove the "no Content-Length header" warning if HTTP response lacks file size information

- Fix `get_token()` not returning symbol information

- Added `Client.close()` and `CachedHTTPTransport.close()` for explicit closing of streams
- Fix `JUPYTER_PLATFORM_DIRS` warning when importing
- Fixed bunch of Pandas warnings
- Add `pytest -Werror` to ensure the lib does not raise any warnings